diff --git a/core/src/main/java/com/boydti/fawe/command/AnvilCommands.java b/core/src/main/java/com/boydti/fawe/command/AnvilCommands.java
index c7dfc114..d96727dc 100644
--- a/core/src/main/java/com/boydti/fawe/command/AnvilCommands.java
+++ b/core/src/main/java/com/boydti/fawe/command/AnvilCommands.java
@@ -39,7 +39,7 @@ public class AnvilCommands {
     }
 
     @Command(
-            aliases = { "/replaceall", "/rea", "/repall" },
+            aliases = {"/replaceall", "/rea", "/repall"},
             usage = "<folder> [from-block] <to-block>",
             desc = "Replace all blocks in the selection with another",
             flags = "d",
@@ -73,7 +73,7 @@ public class AnvilCommands {
     }
 
     @Command(
-            aliases = { "/replaceallpattern", "/reap", "/repallpat" },
+            aliases = {"/replaceallpattern", "/reap", "/repallpat"},
             usage = "<folder> [from-block] <to-pattern>",
             desc = "Replace all blocks in the selection with another",
             flags = "d",
@@ -96,6 +96,7 @@ public class AnvilCommands {
         final LongAdder count = new LongAdder();
         queue.filterWorld(new MCAFilter() {
             private final Vector mutable = new Vector(0, 0, 0);
+
             @Override
             public void applyBlock(int x, int y, int z, BaseBlock block) {
                 if (matchFrom.apply(block)) {
@@ -117,7 +118,7 @@ public class AnvilCommands {
     }
 
     @Command(
-            aliases = { "/countall" },
+            aliases = {"/countall"},
             usage = "<folder> [hasSky] <id>",
             desc = "Count all blocks in a world",
             flags = "d",
diff --git a/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAChunk.java b/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAChunk.java
index b9e6c97c..8ac538d9 100644
--- a/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAChunk.java
+++ b/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAChunk.java
@@ -191,7 +191,10 @@ public class MCAChunk extends FaweChunk<Void> {
         streamer.readFully();
     }
 
-
+    public void setDeleted(boolean deleted) {
+        setModified();
+        this.deleted = deleted;
+    }
 
     public boolean isModified() {
         return modified;
diff --git a/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFile.java b/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFile.java
index 84c7f2b4..caff1dda 100644
--- a/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFile.java
+++ b/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFile.java
@@ -49,6 +49,8 @@ public class MCAFile {
     private byte[] buffer2 = new byte[Settings.HISTORY.BUFFER_SIZE];
     private byte[] buffer3 = new byte[720];
 
+    private final int X, Z;
+
     private Map<Integer, MCAChunk> chunks = new HashMap<>();
 
     public MCAFile(FaweQueue parent, File file) throws Exception {
@@ -57,6 +59,9 @@ public class MCAFile {
         if (!file.exists()) {
             throw new FaweException.FaweChunkLoadException();
         }
+        String[] split = file.getName().split("\\.");
+        X = Integer.parseInt(split[1]);
+        Z = Integer.parseInt(split[2]);
         this.locations = new byte[4096];
         this.raf = new BufferedRandomAccessFile(file, "rw", Settings.HISTORY.BUFFER_SIZE);
         raf.readFully(locations);
@@ -78,6 +83,18 @@ public class MCAFile {
         this(parent, new File(parent.getSaveFolder(), "r." + mcrX + "." + mcrZ + ".mca"));
     }
 
+    public int getX() {
+        return X;
+    }
+
+    public int getZ() {
+        return Z;
+    }
+
+    public File getFile() {
+        return file;
+    }
+
     public MCAChunk getCachedChunk(int cx, int cz) {
         int pair = MathMan.pair((short) (cx & 31), (short) (cz & 31));
         return chunks.get(pair);
diff --git a/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFilter.java b/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFilter.java
index 4b9d70dc..4834f303 100644
--- a/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFilter.java
+++ b/core/src/main/java/com/boydti/fawe/jnbt/anvil/MCAFilter.java
@@ -2,22 +2,62 @@ package com.boydti.fawe.jnbt.anvil;
 
 import com.sk89q.worldedit.blocks.BaseBlock;
 
+/**
+ * MCAQueue.filterWorld(MCAFilter)<br>
+ *  - Read and modify the world
+ */
 public class MCAFilter {
+
+    /**
+     * Check whether a .mca file should be read
+     * @param mcaX
+     * @param mcaZ
+     * @return
+     */
     public boolean appliesFile(int mcaX, int mcaZ) {
         return true;
     }
 
+    /**
+     * Do something with the MCAFile<br>
+     *  - Return null if you don't want to filter chunks<br>
+     *  - Return the same file if you do want to filter chunks<br>
+     * @param file
+     * @return file or null
+     */
     public MCAFile applyFile(MCAFile file) {
         return file;
     }
 
+    /**
+     * Check whether a chunk should be read
+     * @param cx
+     * @param cz
+     * @return
+     */
     public boolean appliesChunk(int cx, int cz) {
         return true;
     }
 
+    /**
+     * Do something with the MCAChunk<br>
+     *  - Return null if you don't want to filter blocks<br>
+     *  - Return the chunk if you do want to filter blocks<br>
+     * @param chunk
+     * @return
+     */
     public MCAChunk applyChunk(MCAChunk chunk) {
         return chunk;
     }
 
+    /**
+     * Make changes to the block here<br>
+     *  - e.g. block.setId(...)<br>
+     *  - Note: Performance is critical here<br>
+     * @param x
+     * @param y
+     * @param z
+     * @param block
+     */
     public void applyBlock(int x, int y, int z, BaseBlock block) {}
 }